This disclosure discusses the problems associated with preservation of food products while avoiding undesirable high pressures, additives, or other chemical treatments. The disclosed invention will reduce spoilage in food products, particularly liquid food products, by removing oxidants, enzymes, and killing bacteria without using heat or undesirable additives. The process of the invention uses a combination of moderate pressure and reactive gases, such as hydrogen, carbon dioxide, or nitrous oxide to treat food products, and then removes the reactive gases by purging the food product with an inert gas. The final product is substantially free of unwanted microorganisms, enzymes, and oxidants that cause spoilage of the food product.